Re: USNO A2.0 "R"

[Michael Koppelman <lolife@bitstream.net>]

I found a conversion for Tycho as follows:

Rc = V - 0.5 * (B-V)

I'm going to use this until/unless I find something better. My 
goal is to be able to plot TASS V, TASS Ic and Koppelman Rc 
together in a manner that has some meaning.

cheers,
Michael K.

On Wednesday, September 18, 2002, at 07:10  AM, Stupendous Man wrote:

> The Tycho catalog provides B and V magnitudes for its stars. USNO-A2.0
>     uses these and Henden's photometric conversion tables 
> between (B,V) and
>     (O+E+J+F) to set the bright end of the photometric
>     calibration for each plate.  This is an improvement over USNO-A1.0.